Big storage tanks can be a big problem if they aren’t maintained through regular cleanings and inspections. One of the most important inspections is the API-653. Tanks that fall under this program are field built and typically larger than 30 feet in diameter. The code for the program is written and maintained by the American Petroleum Institute (API-653), and it details all required inspections, inspection intervals, the acceptance of inspection results, and tank repairs. Remember that all of the records regarding inspection reports and repairs must be kept on file for the life of the tank. Ready to learn more about one of the most common above ground storage tank inspections? Scroll down to discover the API-653.
OFF-STREAM INSPECTION
An off-stream inspection (tank taken out of service) is required every ten years. The tank floor plates and (at least) the first shell course must be completely clean inside to facilitate the inspections of the tank’s internal components. The floor plates cannot have any product, water, or rust on them, because this would interfere with the MFL and visual inspection of the floor plates. The following inspections are typically performed during an off-stream inspection:
Additional inspections may be required depending on the results of the initial inspections (i.e. Magnetic Particle (MT) on the welds).
A final report must be completed showing all inspection results and recommendations. This report should show the short- and long-term corrosion rates as well as a remaining life calculation. Finally, the report must be reviewed by a client-approved engineer to determine if the tank is suitable for continued service.
ON-STREAM INSPECTION
An on-stream inspection (tank not taken out of service) should be performed every five years. The following normal inspections are typically performed during on-stream inspections:
Additional inspections may be required depending on the results of the initial inspections (i.e. Magnetic Particle (MT) on the welds).
A final report must be completed showing all of the inspection results and recommendations. This report should show short- and long-term corrosion rates and a remaining life calculation. Finally, the report should be reviewed by a client-approved engineer to determine if the tank is suitable for continued service.
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Is your storage tank due for any above ground storage tank inspections? If so, contact Environmental Works, a full-service environmental consulting and contracting firm. With our many years of experience managing major environmental projects, you can feel comfortable trusting us with your storage tank needs. We can provide API-653 Inspections as well as cleaning and confined space entry. To learn more about our services, please give us a call at 417-890-9500 or contact us online.
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